This kind of plot is such a fun sandbox for writers because the 'mistake' forces characters into a prolonged, intimate performance before they've built any real emotional connection. It strips away the usual courtship rituals and dumps them straight into the domestic mundane, which creates this bizarre pressure cooker. They're playing house while still being virtual strangers, and that friction is where the real development happens. It’s not just about falling for someone despite the circumstances; it’s about the circumstances themselves becoming the foundation for something real.
A book that nailed this for me was 'The Marriage Mistake' by that indie author on Radish—can’t recall the name. The leads, a workaholic CEO and a artist, get hitched in Vegas and decide to stay married for a tax benefit, fully planning to divorce in a year. The romance bloomed in the dumbest, smallest ways: arguing over grocery lists, learning each other's coffee orders, noticing when the other was stressed from work. The 'mistake' gave them a safety net to be brutally honest because the stakes felt artificially low, which ironically allowed them to be more vulnerable. The accidental setup removed the performative aspect of dating.
That’s the core dynamic I love: the marriage is a social contract entered by error, but fulfilling its day-to-day obligations gradually builds a genuine partnership. The characters often start by meticulously defining boundaries, only to find those boundaries constantly eroded by shared chores, inside jokes, and forced proximity during a family crisis. The 'mistake' provides a plausible reason for them to see sides of each other no new romantic partner normally would, fast-tracking a depth that usually takes months or years.